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Statements of Consolidated Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
OPERATING ACTIVITIES    
Net income $ 24,013 $ 22,044
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization 8,233 7,664
Provision for accounts receivable allowances 1,111 1,090
Provision for inventory reserves 1,109 1,131
Deferred income taxes (59) (2,157)
Share-based compensation expense 2,179 2,178
Excess tax benefits from share-based awards (116) (203)
Gain on sale of property and equipment (133) (28)
Other - net (18) 72
Changes in operating assets and liabilities:    
Accounts receivable (8,460) (15,676)
Inventories 654 (16,004)
Trade accounts payables and accrued liabilities 8,504 13,088
Income taxes payable (359) 4,864
Other - net (1,351) (3,218)
NET CASH PROVIDED BY OPERATING ACTIVITIES 35,307 14,845
INVESTING ACTIVITIES    
Capital expenditures (15,540) (12,503)
Business acquisitions, net of cash acquired (5,173) 0
Proceeds from the sale of property and equipment 1,910 228
Restricted cash 0 (330)
NET CASH USED IN INVESTING ACTIVITIES (18,803) (12,605)
FINANCING ACTIVITIES    
Increase (decrease) in notes payable to banks (1,260) 1,756
Proceeds from the issuance of long-term debt 51,974 49,629
Payments of long-term debt (65,254) (46,236)
Dividends paid (3,305) (3,286)
Excess tax benefits from share-based awards 116 203
Earn-out consideration payment (1,148) 0
Proceeds from issuance of common shares 324 1,023
Purchase of common shares for treasury (2,094) (3,522)
NET CASH USED IN FINANCING ACTIVITIES (20,647) (433)
Effects of exchange rate changes on cash and cash equivalents 132 (711)
Net increase (decrease) in cash and cash equivalents (4,011) 1,096
Cash and cash equivalents at beginning of year 32,126 22,655
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 28,115 $ 23,751